Why does a dishwasher have to drain through the sink plumbing?

• <div><p>Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.</p></div>

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Verified Reviews for Dishwasher Installation pros in Oakbrook, KY

*The Angi rating for Dishwasher Installation companies in Oakbrook, KY is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

*The HomeAdvisor rating for Dishwasher Installation companies in Oakbrook, KY is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

Last update on February 16, 2026

Reviewed in February 2026
Jordan was very knowledgeable and very timely completing the job. He also pointed out and demonstrated that there may be a further drain issue that he recommended to have cleared before i use my dishwasher - I agreed. I also appreciated his understanding of my financial issue and he was...
J&P Plumbing
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Reviewed in April 2025
What a great job! And in a short amount of time we had our new cabinets installed, our new microwave installed, as well as our dishwasher. They also repaired some wall and ceiling issues we were dealing with. We couldn?t be happier with the results! Will definitely use this company again, and...
J.C Valley Construction LLC
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Reviewed in April 2025
These guys were awesome. I was left without a dishwasher because my old one was hardwired but my new one needed a plug, and Dustin and his guys squeezed me in with very little notice and did great work. I can't stress enough how wonderful they were to work with and be around.
More Power To You LLC
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Reviewed in April 2024
I renovated my kitchen and had to upgrade the electric to accommodate the dishwasher and upgraded appliances. Andrew rewired the kitchen, moved several outlets, and made upgrades in the electrical box. He priced it fairly and completed the work on time and to code. He was also polite,...
Bell Electric, LLC
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Reviewed in March 2024
installers Ryan A and Matt H did a excellent job on the shower install. arrived around 9AM tore the old tub and shower out and completed the new shower install around 5PM,not to forget their supervisor stopping by to do a little plumbing job with the project.A fine group of guys to have on site.
West Shore Home Lexington
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Reviewed in September 2023
The installer did an excellent job.
The Gutter Magician of Northern Kentucky, Inc.
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Reviewed in May 2023
The work was done in a timely manner and the installer did very professional work
RS Lightning Protection
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Reviewed in May 2021
Informative and helpful. Was able to come out the day after we talked to replace a dishwasher that was extremely old and not installed correctly. Would highly recommend.
Premier Kitchen Solutions LLC
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Reviewed in January 2021
My dishwasher is working fine now.
A Budget Appliance Repair
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Reviewed in May 2020
Fixed a pipe and my dishwasher draining issues for a very reasonable price and stayed until the job was complete.
Plush-N-Plush
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Dishwasher Installation questions, answered by experts

A dishwasher can help save you significant time when it comes to getting your dishes clean. It can also get your dishes more hygienically clean than washing by hand due to higher water temperatures and specialized detergents, effectively sanitizing them and reducing the risk of foodborne illnesses. Compared to hand-washing, a dishwasher typically uses less water and energy to clean the same amount of dishes, making it a more resource-efficient option.

Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

It’s not worth fixing a 20-year-old dishwasher or any 20-year-old appliance. Twenty years is beyond the useful life span of nearly every major household appliance. Once the appliance nears the end of its useful life span, repairs will become more frequent. A replacement often becomes more cost-effective at that point.

Your dishwasher drains through a hose that attaches to the plumbing below your sink or snakes out the back of your machine. In most cases, you can access one side of the hose from below your sink, as it usually ties into the same drainline that your sink uses. Otherwise, you may need to pull the dishwasher out of the counter to access it.

Leaks, poor drainage, failure to start, water not heating, and excessive noise frequently require service.

The Oakbrook, KY homeowners’ guide to dishwasher installation services

From average costs to expert advice, get all the answers you need to get your job done.

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